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FSC239Y5 (435)
Lecture

1009 Blood Stain Pattern Analysis.docx

4 Pages
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Department
Forensic Science
Course Code
FSC239Y5
Professor
Hisham Ragab

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Description
th October 9 , 2012 Bloodstain Pattern Evidence Check list: - Define crime scene reconstruction - Discuss the formation that can be gain from bloodstain pattern analysis about the events - Explain how the surface texture, directionality, and angle of impact affect the shape of individual bloodstains - Describe the classification of low, medium, high-velocity impact spatter - Discuss the methods to determine the area of convergence and area origin for impact spatter pattern - Describe the methods for documenting bloodstain patterns at a crime scene What is Bloodstain Pattern Analysis? - The study of the size, shape, location, and distribution of bloodstains in order to provide an interpretation of the events which gave rise to their origin - Applied science (using scientific information to apple) - Objective and subjective elements – pattern interpretation - Limitations (NAS report, 2009) - Bloodstain pattern (indoor/ outdoor/ clothing/ footwear/ footwear impression) History - Hans Gross (1847-1915) o Austrian criminalist o Described the relevance of the shapes and distortions - Eduard Piottrowsky o Took live rabbits to see patterns - Victor Balthazard o Determined width and length ratio of blood on flat surface – area of origin - Paul Kirk o Sam Sheppard case o Evidence of position o Led to acquittal to Sheppard - Herb MacDonell o Began to provide instructions on blood pattern analysis o Founding members of IABPA o BPA clothing and vehicle - Regina v McPherson and Burke o First known case of bloodstain pattern evidence in Canada - William Hodgson Ellis o Examination of bloodstains on clothing - 1978 – training program - 1982 – teach math and physics course - 2001 – OPC develops bloodstain training program - Approx. 30 BPS analysts in Canada Blood Basics - Approximate 5 litres in average adult o 55% plasma (serum) o 45% formed elements (red and white blood cells, and plates) - Blood is 4 times more viscous than water - Surface tension- The elastic like property of the surface of the liquid caused by the forces of attraction between the molecules of the liquid that makes it contract and assume the smallest possible shape (i.e. a blood droplet in flight will possess the shape of a sphere (ball)) - Caused by cohesive force of molecules with blood - The ability of blood to reproduce specific patterns is not affected to any significant degree by: age, sex, alcohol content, disease process - It can be measured by high speed video Bloodstain Pattern Analysis - Categories  P ASSIVE (caused by the force of gravity only)  Drip  Splash - elongated spins coming from centre  Pool - blood exit the body and form a pattern at the lowest point
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